# Relationship history for MSHA mine 0101254

Current hierarchy: **Drummond Company Inc → Drummond Company, Inc. → Sayre Prep Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Drummond Company Inc → Sayre Prep Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sayre Processing Company → Sayre Prep Plant; 1974-01-01 to 1976-04-01; source msha-controller-operator-history
- **controller_controls_mine:** Republic Steel Corp → Sayre Prep Plant; 1974-01-01 to 1976-04-01; source msha-controller-operator-history
- **controller_controls_operator:** Republic Steel Corp → Sayre Processing Company; 1974-01-01 to 1976-04-01; source msha-controller-operator-history
- **operator_operates_mine:** Drummond Company, Inc. → Sayre Prep Plant; 1976-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Drummond Company Inc → Drummond Company, Inc.; 1976-04-02 to current/open; source msha-controller-operator-history